Australian New Zealand Standard AS / NZS Pipelines – Gas and Liquid Petroleum – Field Pressure Testing – Western Australia. AS – , Field Pressure Testing, Revision committed formed, Expected AS – , Safety Management Studies, With. AS/NZS Accessed by CITIC PACIFIC MINING PTY LTD on 03 Dec AS/NZS Australian/New Zealand Standard?.
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Consideration is to be given to the effect of pressure on all components in the test section, e.
AS Pipelines-Gas and liquid petroleum – Field pressure testing_图文_百度文库
Where this has been done in practice, the occurrence of ruptures during field ws from manufacturing defects has almost disappeared. Where the test pressure is to be used to determine the MAOP, the accuracy of the pressure-measuring-device shall be 0. At the time work was started, there were strong differences of technical opinion in Australia on the merits and techniques of yield testing of pipelines.
The date or dates on which the test was conducted. Design and construction Part 3: Permanent strain of 0. An understanding of the uncertainty of the assessment of whether the test section is leaking or not ae an integral element of the assessment of the test.
It therefore appears that there is some technical basis for, as well as experience of, a minimum factor of 1. This allows simple assessment of the extent to which a leak or instrument error could be relevant.
Larger air volumes are acceptable at higher test pressures. The reliability of laboratory tensile tests for assessing premature end-points is further reduced because they are often performed on flattened strap test pieces removed from pipe by oxy-cutting.
The pressure strength is an important parameter used to calculate the MAOP of a pipeline. A hold period of not less than 3 h shall be used. G-frame, captive end caps, on line pipe? F1 The total water added may be measured volumetrically in a test of either increasing or decreasing pressures.
The Standard was widely accepted and was 22885.5 and reissued in Verification determines that the instrument satisfies grading requirements. The standard allowable test fluid leakage rate see Table 5. If, however, the strength test is carried out well beyond the minimum requirement, a lower level of accuracy is sufficient since uncertainty in the reading is of no consequence.
T is less than? V2 0 0. For more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options.
For examples of interpretation of specified values in accordance with the rounding method, see AS There may be temperature gradients within the water from the pipeline centre and the pipeline inner surface, and there will be temperature variation in the water and the steel along a long section of pipeline and in a pipeline with varying depths of cover. The altered values shall be justified and approved. These should include a warning about excess pressure being developed due to solar radiation.
The data from Table F2, when plotted as in Figure F2, indicate 0. In a section of this size e.
Unlike the hold pressure for the pressurecontrolled test, the hold pressure for the yield test is not known in advance of the test but is determined during the test from the actual behaviour of the test section in situ. The application of xs charts in the field is not permitted. Where the section is buried or submerged and is long, or temperature variations could give rise to significant pressure changes, correlation of temperature and pressure measurements is essential and the sensitivity of the pressure measurement equipment and the method and sensitivity of temperature measurement are specified.
This edition of the Standard addresses these issues and updates the Standard in a number of other areas.
A lower straining rate reduces the stress at which yielding occurs. For guidance on this selection of end-point see Appendix D.
A typical summary report of a single test section is given in Appendix H.
SCOPE OF ACCREDITATION
Operating temperature of the gas B1 1 Where a restrained pipeline contains a significant amount of pipe of a differing thickness, or for a telescoped pipeline, Equation Aas becomes—? Leakage rate has much less effect on a half-slope end-point. However, a clear definition of what constitutes a successful test is required.
If the instrument verification shows it does not comply, it may not be used. This Appendix describes two methods of residual air determination as follows: The maximum section length can be increased, but not more than doubled, provided the leak test hold time is increased to 48 h.
This Standard also provides additional information on a number of subjects, which would assist the experienced and competent person in the preparation of the test program and the assessment of the test, and would contribute to the understanding of the testing of pipelines by approving authorities, owners, designers, and contractors.